Outrage over a photo of the spikes prompted Slate to publish a feature, “Are Anti-Homeless Sidewalk Spikes Immoral?” Slate’s coverage includes photos of several anti-homeless installations in New York, London, Madrid and elsewhere.

Actress Mia Farrow sent the Slate link along to her followers.

https://twitter.com/MiaFarrow/status/477166909121892352

Some are doing more than expressing their disgust on Twitter, however. Occupy Wall Street posted a photo of some “direct action” — “activists” pouring concrete over such a set of spikes.